Aroania (Greek: Αροάνια), also known as Chelmos (Χελμός, from South Slavicchlmo, summit[2]), is a mountain range in Achaea, Peloponnese, Greece. At 2,355 m elevation, Aroania is the third highest mountain of the Peloponnese, after Taygetus and Kyllini, and the highest in Achaea.[1] The largest town near the mountain is Kalavryta. The municipal unit Aroania took its name from the mountain.

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Aroania is situated in southeastern Achaea, near the border with Corinthia. The slightly higher Kyllini mountain is about 15 km to its east, separated from Aroania by the valley of the river Olvios. The mountain Erymanthos is about 30 km to the west, across the valley of the river Vouraikos. The rivers Krios, Krathis and Vouraikos drain the mountain towards the Gulf of Corinth in the north. The river Aroanios drains the mountain towards the southwest, to the Ionian Sea.

The parts of Aroania between 800 m and 1,800 m elevation are covered with pine forests. The higher areas consist of grasslands and barren rock. Aroania is rich in butterfly species,[3] including the Chelmos blue (Agrodiaetus iphigenia) which is found between 1,100 m and 1,800 m.[4]